Abstract: This disclosure relates to blood flow reversal valves and related systems and methods. In certain aspects of the invention, a blood flow reversal valve includes a first member having a first passage and a second passage, and a second member having a first passage and a second passage. The first and second members are rotatably fixed relative to one another such that the first passage of the first member is aligned with the first passage of the second member and the second passage of the first member is aligned with the second passage of the second member. A flow directing element is disposed in the cavity and is moveable relative to the first and second members between a first position in which the first passage of the first member and the first passage of the second member are fluidly connected and a second position in which the first passage of the first member and the second passage of the second member are fluidly connected.

Abstract: A method and device are provided for determining the transmembrane pressure during an extracorporeal blood treatment in which blood flows at a defined blood flow rate through an arterial blood conduit of an extracorporeal blood circuit into the inlet of a first chamber of a dialyzer, which is divided by a semipermeable membrane into the first chamber and a second chamber, and flows through a venous blood conduit from the outlet of the first chamber of the dialyzer, while dialysis liquid flows through a dialysis liquid supply conduit into the inlet of the second chamber of the dialyzer and flows through a dialaysis liquid discharge conduit from the outlet of the second chamber of the dialyzer.

Abstract: The present invention relates to a device for controlling a system for transporting blood, and a method for transporting blood in a blood line of an extracorporeal blood circuit of an extracorporeal blood treatment system. The present invention also relates to an extracorporeal blood treatment device comprising such a system for transporting blood. The method and device according to the present invention are based on the fact that a defined threshold value for the pressure in the blood line should not be exceeded. The system for transporting blood is controlled in such a way the blood in the blood line is transported in a pre-determined volume flow as long as the pressure in the blood line is below the pre-determined threshold value. When the pressure in the blood line reaches the pre-defined threshold value, however, the system for transporting blood is controlled such that a pressure value corresponding to the threshold value is set when the blood is transported in the blood line.